body{margin: 0;padding: 0;}
#canvas{border:solid 1px #ddd;float: left;}
.right,.right p input{float: left;}
.layer,.layer_content{position: absolute; left: 0;top: 0;background: #fff; z-index: 9; width: 100%;
height: 100%;opacity: 0.7; display: none}
.layer_content{z-index: 10;opacity: 1; background: transparent; }
.about{clear: both;padding: 20px; text-align: center;}